U-410-435

(Top groove power insulators)
U-410
Manufacturer or Marking
No Name (Pittsburg) (USA)
U-410
Size: 82mm X 95mm (3 ¼ x 3 ¾)
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Fred Collier
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U-411
Manufacturer or Marking
No Name (Locke) (USA)
U-411
Size: 107mm X 88mm (4 ¼ x 3 ½)
Example in Photo: No Name (Locke) (USA)
Photo Credit: Mike Green
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U-412
Manufacturer or Marking
No Name (P.P. Inc) (USA)
U-412
Size: 123mm X 101mm (4 x 4)
Example in Photo: No Name (P.P. Inc) (USA)
Photo Credit: James Lindsey
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U-412A
Manufacturer or Marking
No Name (Franklin Porcelain) (USA)
Franklin Porcelain (USA)
U-412A
Size: 123mm X 101mm (4 x 4)
Example in Photo: Franklin Porcelain (USA)
Photo Credit: Fred Collier
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U-414
Manufacturer or Marking
No Name (USA)
Victor Ins. Inc. (USA)
U-414
Size: 174mm X 101mm (6 x 6)
Example in Photo: No Name (USA)
Photo Credit: Alan Hohnhorst
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U-416
Manufacturer or Marking
No Name (Thomas) (USA)
U-416
Size: 107mm X 101mm (4 ¼ x 4)
Example in Photo: No Name (Thomas) (USA)
Photo Credit: Elton Gish
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U-418
Manufacturer or Marking
No Name (USA)
No Name (Westinghouse) (USA)
Illinois (USA)
Locke (USA)
PP (USA)
THOMAS (USA)
Westinghouse (USA)

NOTE: In 2008 and older reference books, There was a U-418A, U-481B and U-481C. They are all variations of U-418
U-418
Size: 127mm X 101mm (5 x 4)
Example in Photo: Westinghouse (USA)
Photo Credit: Charles Robinson
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U-419
Manufacturer or Marking
No Name (USA)
No Name (Westinghouse) (USA)
Westinghouse 918439 (USA)

NOTE: In 2008 and older reference books, There was a U-419A It is now part of the U-419 listing as it was the same unit.
U-419
Size: 139mm X 98mm (5 ½ x 3 )
Example in Photo: No Name (USA)
Photo Credit: James Lindsey
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U-421
Manufacturer or Marking
No Name (Westinghouse) (USA)
No Name (P.P. Inc) (USA)
Westinghouse 968881(USA)
U-421
Size: 174mm X 120mm (6 x 4 ¾)
Example in Photo: No Name (Westinghouse) (USA)
Photo Credit: Ben Kirsten
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U-425
Manufacturer or Marking
Lapp (USA)
Size: 149mm X 146mm (5 x 5 ¾)
Variations: Click on the thumbnail above to see style variations
Variations: Tap on the thumbnail above to see style variations
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U-425A
Manufacturer or Marking
Chance (USA)
Victor Ins. Inc. (USA)
U-425A
Size: 152mm X 139mm (6 x 5 ½)
Example in Photo: Victor Ins. Inc. (USA)
Photo Credit: Elton Gish
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U-425B
Manufacturer or Marking
Knox (USA)
U-425B
Size: 142mm X 139mm (5 x 5 ½)
Example in Photo: Knox (USA)
Photo Credit: Robert Winkler
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U-431
Manufacturer or Marking
No Name (Thomas, BJS) (USA)
U-431
Size: 149mm X 117mm (5 x 4 )
Example in Photo: No Name (Thomas, BJS) (USA)
Photo Credit: Bill Vincent
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U-432
Manufacturer or Marking
No Name (Thomas) (USA)

Note: Cross-top
U-432
Size: 146mm X 114mm (5 ¾ x 4 ½)
Example in Photo: No Name (Thomas) (USA)
Photo Credit: Robin Harrison
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U-432A
Manufacturer or Marking
No Name (USA)

Note: Cross-top
U-432A
Size: 146mm X 117mm (5 ¾ x 4 )
Example in Photo: No Name (USA)
Photo Credit: Mid Norris
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U-433
Manufacturer or Marking
No Name (Thomas, 2 Part Glazeweld) (USA)

Note: Insulator is a Cross-top - Glazeweld - In 2008 and older Reference books, this was known as U-958.
U-433
Size: 146mm X 120mm (5 ¾ x 4 ¾)
Example in Photo: No Name (Thomas, 2 Part Glazeweld) (USA)
Photo Credit: Shaun Kotlarsky
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U-433A
Manufacturer or Marking
No Name (Thomas, 2 Part Glazeweld) (USA)

NOTE: Glazeweld - In 2008 and older Reference books, this was known as U-958A.
U-433A
Size: 149mm X 120mm (5 x 4 ¾)
Example in Photo: No Name (Thomas, 2 Part Glazeweld) (USA)
Photo Credit: Mid Norris
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U-433B
Manufacturer or Marking
No Name (Thomas, 2 Part Glazeweld) (USA)

NOTE: Glazeweld - In 2008 and older Reference books, this was known as U-958B.
U-433B
Size: 146mm X 130mm (5 ¾ x 5 )
Example in Photo: No Name (Thomas, 2 Part Glazeweld) (USA)
Photo Credit: Robin Harrison
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U-434
Manufacturer or Marking
No Name (Thomas, 2 Part Glazeweld) (USA)

NOTE: Found in New Zealand, probably early Lisbon Thomas production 1906
U-434
Size: 146mm X 101mm X 120mm (5 ¾ x 4 x 4 ¾)
Example in Photo: No Name (Thomas, 2 Part Glazeweld) (USA)
Photo Credit: Elton Gish
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